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 A191480 Number of n X n symmetric binary matrices with each 1 adjacent to no more than 4 king-move neighboring 1s 1
 2, 8, 51, 624, 14937, 660986, 54708660, 8491650283, 2464559025659, 1339399598735349, 1362655720519108653, 2594569727636065556778, 9247397059247356652311714, 61693653372161864968465187134 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..16 EXAMPLE Some solutions for n=4 ..0..0..0..0....0..0..1..0....1..1..0..0....0..0..1..0....0..0..1..0 ..0..1..0..0....0..0..1..1....1..0..1..1....0..1..0..0....0..0..0..0 ..0..0..1..0....1..1..0..0....0..1..0..0....1..0..1..0....1..0..1..1 ..0..0..0..0....0..1..0..1....0..1..0..1....0..0..0..1....0..0..1..1 CROSSREFS Sequence in context: A277506 A059429 A249747 * A013555 A018987 A030518 Adjacent sequences:  A191477 A191478 A191479 * A191481 A191482 A191483 KEYWORD nonn AUTHOR R. H. Hardin Jun 03 2011 STATUS approved

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Last modified February 28 10:22 EST 2020. Contains 332323 sequences. (Running on oeis4.)